Instrumental Magnitude in reports

I'm a little confused what I should report in the fields for instrumental magnitudes of the check star.

When I view the details of these stars, there is a field called "Instr.Mag" which usually gives me a negative number.

When I use only one comp star and one check star, the instr. magn. in the AAVSO-report-files also give me negative numbers, the same as the detail-list of these stars. But when I use more than one comp star, the instr. magn. in the report field gives me the measured std-magnitude of my check star, not its instr. magn.

What should I report in this case?

greetings

katy